COFFEE LEAF SPOT IN PORTO RICO. 9 
More than 400 trees were examined and only 7, or less than 2 per 
cent, showed any infection. These seven were all near the south- 
western border and the infections were slight. Where only several 
leaves were infected, they were removed; where a number were in- 
fected, the tree was cut down. As in little more than 19 months from 
the time of clearing absolutely no infection was found, except near 
the border where its reentry was to be expected because badly in- 
fected trees were near by, the elimination of disease through the 
original clearing of the plat was considered to be all that could be 
desired. 
When the fifth inspection was made on November 12, 1919, the 
plat was found to need cleaning. The renews were in splendid shape 
and averaged approximately 6 feet high (PL III, fig. 2). Some of 
them were 9 feet or more in height. About four months prior to this 
date the overseer on his own initiative set some 600 or more young 
coffee trees throughout the plat below the path and a few above it 
at the west side. Many of these had been brought in from the dis- 
eased coffee outside the plat, and their leaves were riddled with Stil- 
bella spots. Inasmuch as these trees had not only been carried 
through the planted area with every chance for thousands of fruiting 
bodies to drop and establish themselves on all sides but were allowed 
to remain there for some months as centers of infection, no further 
control over the disease could be expected to result from the original 
cleaning out. 
The renews of more than a hundred coffee trees were examined 
with great care. Most of these were above the path where the over- 
seer's replanting would not affect them, and some were below the 
path. With the exception of a single spot on one leaf, no other in- 
fection was seen on any of these. This tree was just below the path, 
into which its branches extended. Near it on both sides were young 
trees which the overseer had set. Below it was a small volunteer 
seedling which had one spot on one leaf. Some infection was ob- 
served in the V-shaped corner at the south where the wind was evi- 
dently bringing in fruiting bodies from the diseased plants outside. 
During the first week in December, 1919, an attempt was made to 
clean out such disease as was visible, and a laborer who had worked 
for some years with the station pathologist was sent to the plantation. 
He reported 829 old trees in all. Of these, 695, or 83.8 per cent, 
showed no Stilbella spots; 75 trees, or 9 per cent, showed not more 
than two spotted leaves ; and 59 trees, or 7.1 per cent, showed three 
or more spotted leaves. Of this last group, 12 trees were within 2 
to 4 feet of the border of the plat. Above the path he found but 
two old trees which showed any infection and these were near the 
western border. 
